KR101186288B1

KR101186288B1 - Apparatus for reducing relative motion between two ships

Info

Publication number: KR101186288B1
Application number: KR20100116216A
Authority: KR
Inventors: 김문성; 김병우; 하문근
Original assignee: 삼성중공업 주식회사
Priority date: 2010-11-22
Filing date: 2010-11-22
Publication date: 2012-09-27
Also published as: KR20120054867A

Abstract

A relative motion reduction device is disclosed that reduces the relative motion between two ships mooring in parallel at sea. The disclosed relative motion reduction device is disposed between adjacent fenders among a plurality of collision preventing fenders disposed between two ships to attenuate waves between the two ships. A porous plate is provided, and a plurality of porous plates are supported at both ends thereof connected to adjacent fenders, respectively.

Description

Apparatus for reducing relative motion between two ships}

The present invention relates to a device for reducing the relative motion occurring between two ships mooring in parallel at sea by waves and the like.

In general, natural gas is collected at sea and then liquefied to be stored and transported to the consumer in the form of Liquefied Natural Gas (LNG). In the production, storage and transportation of such liquefied natural gas, vessels such as LNG Floating, Production, Storage and Offloading (FPSO) and LNG Shuttle are used.

The LNG stored in the LNG FPSO is unloaded into the LNG Carrier, where the two vessels, the LNG FPSO and the LNG Carrier, are anchored in parallel at sea.

1A and 1B are a plan view and a front view showing two ships mooring in parallel for the unloading of LNG.

Referring together to FIGS. 1A and 1B, two vessels 10, 20, such as the LNG FPSO 10 and the LNG carrier 20, may be used to maintain the two vessels 10, 20 mooring in parallel at sea. Connected to each other by the mooring lines 30 of the ships, a collision preventing fender 40 is disposed between the two ships 10 and 20 to prevent a collision between the two ships 10 and 20 and maintain a certain distance. do. As described above, in the state in which the LNG FPSO 10 and the LNG carrier 20 are moored in parallel, the LNG FPSO 10 is installed using an LNG loading device installed in the LNG FPSO 10, for example, an offloading arm 50. ), The LNG is unloaded to the LNG carrier 20.

However, since the two vessels 10 and 20 are floating at sea, they are caused by external factors such as waves, tides, and wind. At this time, relative movement occurs between the two vessels 10 and 20 due to different movement responses. The relative motion between the two vessels 10, 20 is caused by a number of factors, but as one of them, high waves are formed between the two vessels 10, 20, so that the mean wave drift in a short period The drift force increases, which leads to an increase in the relative motion in the horizontal / vertical direction, and when such a relative motion is excessive, there is a restriction on the unloading of the LNG through the offloading arm 50.

Embodiments of the present invention provide a relative motion reduction device between two ships that reduces relative motion by damping waves between two ships mooring in parallel at sea.

According to an aspect of the present invention, in the device for reducing the relative motion between two ships mooring in parallel at sea,

A plurality of porous plates arranged between adjacent ones of the plurality of collision preventing fenders disposed between the two vessels to attenuate waves between the two vessels, and connected in a row and having a plurality of through holes, respectively; Equipped,

The plurality of porous plates may be provided with a relative motion reduction device between two vessels, characterized in that both ends thereof are connected to and supported by the adjacent fenders, respectively.

The plurality of porous plates may be connected to each other to be adjacent to each other so as to be folded or unfolded. In this case, the plurality of porous plates may be connected to each other by a connecting plate or hinge having flexibility between adjacent ones.

In addition, both ends of the plurality of porous plates and the adjacent fenders may be connected to each other by hooks and rings.

In addition, a connection member may be coupled to each of both ends of the plurality of porous plates, and the connection members may be connected to the adjacent fenders.

In addition, the connecting member is a relative motion reduction device between the two vessels, characterized in that made of a material that can float on the sea surface.

According to the device for reducing the relative motion between two vessels according to the embodiment of the present invention, since the waves between the two vessels are attenuated by a plurality of porous plates in a line, the relative movement between the two vessels caused by the waves is reduced And additionally leads to a reduction of the mooring load. Accordingly, the loading of cargo between the two ships can be made more stable. And, it can be installed to be floating on the sea surface between the two vessels using a conventional fender, it can be stored separately from the fender when not in use.

1A and 1B are a plan view and a front view showing two ships mooring in parallel for the unloading of LNG.
2 is a plan view schematically showing a relative motion reducing device according to an embodiment of the present invention disposed between two ships mooring in parallel at sea.
3 is a perspective view of the relative motion reduction device shown in FIG.
4 is a perspective view illustrating a process of folding a plurality of porous plates of the relative motion reducing device shown in FIG.
5 is a perspective view showing another example of connecting a plurality of porous plates.

Hereinafter, with reference to the accompanying drawings will be described for the relative motion reduction device between two vessels according to an embodiment of the present invention. In the drawings, the same reference numerals denote the same elements.

2 is a plan view schematically showing a relative motion reducing device according to an embodiment of the present invention disposed between two ships mooring in parallel at sea.

Referring to FIG. 2, two vessels 10, 20, for example LNG FPSO 10 and LNG carrier 20, are moored in parallel for offloading of cargo, ie LNG. As such, the LNG FPSO 10 and the LNG carrier 20 are connected to each other by a plurality of mooring lines 30 to maintain a parallel mooring state at sea. In addition, a plurality of collision preventing fenders 40 are disposed between the LNG FPSO 10 and the LNG carrier 20 to prevent a collision and maintain a predetermined distance.

Relative motion reduction device 100 according to an embodiment of the present invention, by reducing the relative motion by attenuating the waves between the two vessels 10, 20 moored in parallel at sea, between the two vessels (10, 20) Enable stable cargo loading. The relative motion reduction device 100 is disposed between two vessels 10 and 20 using a fender 40 disposed between the two vessels 10 and 20. Specifically, the relative motion reduction device 100 is installed between the fenders 40 adjacent to each other among the plurality of collision preventing fenders 40 disposed between the two vessels (10, 20).

3 is a perspective view illustrating the relative motion reducing device shown in FIG. 2, and FIG. 4 is a perspective view illustrating a process of folding a plurality of porous plates of the relative motion reducing device shown in FIG. 3.

3 and 4 together, the relative motion reduction device 100 according to an embodiment of the present invention, disposed between the two vessels (10, 20) to attenuate the wave between the two vessels (10, 20) A plurality of porous plates 120 is provided. The plurality of porous plates 120 are arranged in a row with adjacent ones connected to each other. The plurality of porous plates 120 may be made of a relatively heavy steel plate to withstand the impact from the waves and to absorb the energy of the waves. In addition, a plurality of through holes 122 are formed in each of the plurality of porous plates 120. As the sea water passes through the through holes 122, a large wave is crushed into small waves, and in this process, wave energy The absorption rate can be increased.

As described above, waves between the two vessels 10 and 20 may be attenuated by a plurality of porous plates 120 connected in a line, and relative movement between the two vessels 10 and 20 generated by the waves. Will also decrease. Accordingly, dropping of cargo between the two vessels 10 and 20 can be made more stable.

The plurality of porous plates 120 may be connected to each other adjacent to be folded or unfolded. For example, the plurality of porous plates 120 may be connected to each other by a connecting plate 124. The connection plate 124 may be made of a flexible material such as rubber so as to be folded or unfolded. The connecting plate 124 may be attached to both edges of the adjacent porous plates 120 by means of adhesive or screw.

5 is a perspective view showing another example of connecting a plurality of porous plates.

Referring to FIG. 5, the plurality of porous plates 120 may be connected to each other by the hinge 126. The hinge 1260 may be fixed to both edges of the adjacent porous plates 120 by a means such as a screw 128.

The plurality of porous plates 120 having the above-described configuration can be folded as shown in FIG. 4 and can also be unfolded as shown in FIG. 3. Accordingly, since the plurality of porous plates 120 can be swung to some extent by the waves, the porous plates 120 can absorb the energy of the waves more efficiently and can be prevented from being damaged by the impact from the waves. In addition, when storing without using the relative motion reduction device 100, when the plurality of porous plates 120 are separated from the fender 40, as shown in Figure 4, the total volume is reduced because It has the advantage of convenient storage.

3 and 4 together, both ends of the plurality of porous plates 120 are connected to the adjacent fenders 40, respectively. Thus, the plurality of porous plates 120 are supported by the fenders 40 to be floating on the sea surface.

Specifically, as a means for connecting the plurality of porous plate 120 and the fenders 40, a hook 132, and a hook 134 that the hook 132 is caught may be used. As shown in FIG. 3, the hook 132 may be provided at the plurality of porous plates 120, and the ring 134 may be provided at the fender 40. On the other hand, on the contrary, the hook 132 may be provided on the side of the fender 40, and the ring 134 may be provided on the side of the porous plate 120. In addition, at least two hooks 132 may be spaced apart in the horizontal direction so that the plurality of porous plates 120 may be horizontal on the sea surface. Similarly, at least two of the rings 134 may be horizontal. May be spaced apart in the direction.

Although both ends of the plurality of porous plates 120 may be directly connected to the fenders 40, as shown in FIGS. 3 and 4, the connecting members 130 are provided at each of both ends of the plurality of porous plates 120. ) Are coupled to each other, and the connecting members 130 may be connected to the fenders 40 using the hook 132 and the ring 134, respectively. Specifically, the connecting members 130 are coupled to both ends of the plurality of porous plates 120 by the connecting plate 124 shown in FIG. 3, or by the hinge 128 shown in FIG. 5. It may be coupled to both ends of the porous plate 120 of. Like the fender 40, the connection members 130 may be made of a material that may float on the sea surface, such as rubber or plastic. In this case, the connecting members 130 may provide additional floating force to the plurality of porous plates 120, and may also help to maintain the horizontal state of the plurality of porous plates 120.

As described above, the relative motion reduction device 100 according to the embodiment of the present invention may be supported by the fenders 40 and float on the sea surface, and more stable by the connecting members 130. This makes it possible to keep level in a floating state on the sea level.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention. Accordingly, the true scope of protection of the present invention should be defined by the appended claims.

10 ... LNG FPSO 20 ... LNG Transport
30.Mooring line 40 ... Collision preventing fender
50 ... offloading arm 100 ... relative motion reduction device
120 ... perforated plate 122 ... through hole
124 ... connection plate 126 ... hinge
128 ... screw 130 ... connection member
132 Hooks 134 Hooks
222 holes

Claims

In a device for reducing the relative motion between two ships in parallel at sea,
A plurality of porous plates arranged between adjacent ones of the plurality of collision preventing fenders disposed between the two vessels to attenuate waves between the two vessels, and connected in a row and having a plurality of through holes, respectively; Equipped,
And said plurality of porous plates are supported at both ends thereof connected to said adjacent fenders, respectively.

The method of claim 1,
The plurality of porous plate, the relative motion reduction device between two vessels, characterized in that the adjacent ones are connected to each other so as to be folded or unfolded.

The method of claim 2,
The plurality of porous plates, the relative movement between the two vessels, characterized in that the adjacent ones are connected to each other by a flexible connecting plate.

The method of claim 2,
The plurality of porous plates, the relative movement between the two vessels, characterized in that the adjacent ones are connected to each other by a hinge.

The method of claim 1,
Opposite ends of the plurality of porous plates and the adjacent fenders are connected to each other by hooks and loops.

The method of claim 1,
A coupling member is coupled to each of both ends of the plurality of porous plates, and the coupling members are connected to the adjacent fenders.

The method according to claim 6,
The connecting member is a relative motion reduction device between the two vessels, characterized in that made of a material that can float on the sea surface.